package main

import . "fmt"
import . "slices"

func main() {
	var n,a1,a2,a3 int
	Scanln(&n)
	_, err := Scanln(&a1)
	if err != nil {
		Println(`"assert"`)
		return
	}
	Scan(&a2,&a3)
	ss:=[]int{a1+a2,a2+a3,a3+a1}
	Sort(ss)
	if ss[2]==ss[1] {
		Println(ss[0])
	} else {
		Println(ss[1])
	}
}